Diesel hydrocracking device

Abstract

The utility model discloses a diesel hydrocracking device. The problem that potential safety hazards exist due to the fact that a sampling valve in an existing diesel hydrocracking device adopts high-pressure sampling is solved. The device comprises a high-pressure reactor and a cold high-pressure separator, the system also comprises a recycle hydrogen desulfurization tower; a liquid separation tank; the circulating hydrogen compressor is used for driving a medium to circulate; the pipeline assembly is used for connecting the cold high-pressure separator with the recycle hydrogen desulfurization tower, the liquid separation tank with the recycle hydrogen compressor and the recycle hydrogen compressor with the high-pressure reactor, so that a medium circulates; the sampling valve group is used for sampling the pipeline assembly, and the sampling valve group is connected with the low-pressure gas desulfurization system; the flow limiting plate is arranged between the pipeline assembly and the low-pressure gas desulfurization system, and the sampling valve group is arranged behind the flow limiting plate and samples a medium behind the flow limiting plate. According to the utility model, the sampling operation difficulty is reduced, and the sampling is safer.

Description

Technical Field

[0001] The utility model relates to the field of petrochemical industry, in particular to a diesel hydrocracking device. Background Art

[0002] The 1# and 2# diesel hydrocracking units are designed with CLG's fixed-bed diesel hydrocracking process. The operating pressure of the reaction system is 10.5MPa. The hydrogen sulfide generated by the reaction is removed with hydrogenation-type amine liquid to ensure the hydrogen purity required for the reaction. The mixed hydrogen sampler is used to monitor the purity of hydrogen entering the reactor system; the circulating hydrogen sampler before desulfurization and the circulating hydrogen sampler after desulfurization are used to monitor the hydrogen sulfide content before and after the circulating hydrogen desulfurization tower to judge the desulfurization effect of the circulating hydrogen desulfurization tower.

[0003] In the existing design, the mixed hydrogen sampler, the pre-desulfurization circulating hydrogen sampler, and the post-desulfurization circulating hydrogen sampler all directly use 10.5MPa high-pressure gas to introduce the medium into the sampler from the medium inlet, and then the pressure reducing valve in the sampler reduces the pressure from 10.5MPa to 2.0MPa-3.0MPa sampling pressure for sampling. The above samplers are all manual intermittent sampling, and the pressure reducing valve often fails to reduce pressure, leaks, and blocks, which greatly increases the difficulty of sampling and poses a major safety hazard. Since the hydrogen sulfide content in the sampling medium is as high as 2000mg-3000mg per cubic meter, the medium gas leaked from the pressure reducing valve during the pressure reduction process can easily cause personnel poisoning. Utility Model Content

[0004] In order to solve the problem that the sampling valve in the existing diesel hydrocracking device in the background technology adopts high pressure sampling, which has potential safety hazards, the utility model provides a diesel hydrocracking device.

[0005] The technical solution of the utility model is: a diesel hydrocracking device, including a high-pressure reactor and a cold high-pressure separator; and also includes:

[0006] A circulating hydrogen desulfurization tower is used to receive the medium separated by the cold high separator and use it for desulfurization;

[0007] Circulating hydrogen compressor, used to drive medium circulation;

[0008] The liquid separator is arranged between the circulating hydrogen desulfurization tower and the circulating hydrogen compressor, and is used to separate the medium from the circulating hydrogen desulfurization tower into gas and liquid, and to supply the gas medium to the circulating hydrogen compressor;

[0009] Pipeline components are used to connect the cold high separator and the circulating hydrogen desulfurization tower, the liquid separator and the circulating hydrogen compressor, and the circulating hydrogen compressor and the high-pressure reactor to allow the medium to circulate;

[0010] A sampling valve group is used to sample the pipeline components, and the sampling valve group is connected to the low-gas desulfurization system;

[0011] The flow limiting plate is arranged between the pipeline assembly and the low-gas desulfurization system. The sampling valve group is arranged behind the flow limiting plate and samples the medium behind the flow limiting plate.

[0012] As a further improvement of the utility model, a one-way valve is provided between the limiting plate and the low-gas desulfurization system, and the one-way valve is used for one-way conduction and preventing the medium of the low-gas desulfurization system from flowing back.

[0013] As a further improvement of the utility model, the limiting plate is provided with a flow hole, the aperture of the flow hole is 2-5 mm, and the maximum flow rate of the sampling valve group during sampling is less than the design flow rate at the limiting plate.

[0014] As a further improvement of the present invention, the diameter of the flow hole is 3 mm.

[0015] As a further improvement of the utility model, the pipeline assembly includes a first pipeline, which is arranged between the cold high separator and the circulating hydrogen desulfurization tower and is used for the medium flow between the cold high separator and the circulating hydrogen desulfurization tower;

[0016] The sampling valve group comprises a first sampling valve, which is arranged on the first pipeline for sampling.

[0017] As a further improvement of the utility model, the pipeline assembly includes a second pipeline, which is arranged between the liquid separator tank and the circulating hydrogen compressor and is used for the medium to flow between the liquid separator tank and the circulating hydrogen compressor;

[0018] The sampling valve group comprises a second sampling valve, which is arranged on the second pipeline for sampling.

[0019] As a further improvement of the utility model, the pipeline assembly includes a third pipeline, which is arranged between the high-pressure reactor and the circulating hydrogen compressor and is used for the medium to flow between the high-pressure reactor and the circulating hydrogen compressor;

[0020] The sampling valve group comprises a third sampling valve, which is arranged on the third pipeline for sampling.

[0021] As a further improvement of the utility model, it also includes a new hydrogen compressor, which is connected to the third pipeline. The third sampling valve is used to sample the mixed hydrogen at the outlets of the new hydrogen compressor and the circulating hydrogen compressor.

[0022] As a further improvement of the utility model, the sampling valve group includes:

[0023] A medium inlet, connected to the pipeline assembly for medium entry;

[0024] Auxiliary port, used for inert medium to enter the cleaning sampling valve group;

[0025] A sampling bottle, used for sampling and collecting the medium introduced into the medium inlet;

[0026] Pressure gauge, used to detect the pressure at the sampling bottle;

[0027] The three-way valve is connected to the medium inlet, the auxiliary port and the sampling bottle respectively; a circulating water cooler is provided between the medium inlet 74 and the three-way valve.

[0028] As a further improvement of the utility model, a pressure reducing valve, a sampling one-way valve and a needle valve are arranged in sequence between the auxiliary port and the three-way valve.

[0029] The beneficial effects of the utility model are that a flow limiting plate is provided to limit the flow of the pipeline assembly entering the sampling valve group, and the sampling valve group is arranged behind the flow limiting plate to reduce the pressure of the medium entering the sampling valve group, thereby solving the problem that the pressure reducing valve at the medium inlet of the existing sampling valve often fails to reduce pressure and leaks, reducing the difficulty of sampling operation and making sampling safer. The utility model also has the advantages of simple structure, convenient assembly, reliable operation, and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Attached Figure 1 It is a schematic diagram of the principle of an embodiment of the utility model.

[0031] Attached Figure 2 This is a schematic diagram of the principle of the sampling valve group according to an embodiment of the utility model.

[0032] In the figure, 1. high-pressure reactor; 2. cold-high separator; 3. circulating hydrogen desulfurization tower; 4. circulating hydrogen compressor; 5. separator tank; 6. pipeline assembly; 61. first pipeline; 62. second pipeline; 63. third pipeline; 7. sampling valve group; 71. first sampling valve; 72. second sampling valve; 73. third sampling valve; 74. medium inlet; 741. circulating water cooler; 75. auxiliary port; 751. pressure reducing valve; 752. sampling check valve; 753. needle valve; 76. sampling bottle; 77. pressure gauge; 78. three-way valve; 8. low-gas desulfurization system; 9. limiting plate; 10. check valve; 11. new hydrogen compressor. DETAILED DESCRIPTION

[0033] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings:

[0034] Depend on Figure 1 Combination Figure 2 As shown, a diesel hydrocracking unit includes a high-pressure reactor 1 and a cold high-pressure separator 2; the main function of the cold high-pressure separator is to separate gas, oil and water, and prevent the generated oil from entering the circulating hydrogen compressor to avoid accidents. It also includes:

[0035] The circulating hydrogen desulfurization tower 3 is used to receive the medium separated by the cold high separator 2 and use it for desulfurization;

[0036] A circulating hydrogen compressor 4, used for driving medium circulation;

[0037] The liquid separator 5 is disposed between the circulating hydrogen desulfurization tower 3 and the circulating hydrogen compressor 4, and is used to separate the medium from the circulating hydrogen desulfurization tower 3 into gas and liquid, and to supply the gas medium to the circulating hydrogen compressor 4;

[0038] The pipeline assembly 6 is used to connect the cold high separator 2 and the circulating hydrogen desulfurization tower 3, the liquid separator 5 and the circulating hydrogen compressor 4, and the circulating hydrogen compressor 4 and the high-pressure reactor 1, so that the medium can flow;

[0039] The sampling valve group 7 is used to sample the pipeline assembly 6, and the sampling valve group 7 is connected to the low-gas desulfurization system 8;

[0040] The limiting plate 9 is arranged between the pipeline assembly 6 and the low-gas desulfurization system 8, and the sampling valve group 7 is arranged behind the limiting plate 9 and samples the medium behind the limiting plate 9. The beneficial effect of the utility model is that a limiting plate is provided to limit the flow of the pipeline assembly entering the sampling valve group, and the sampling valve group is arranged behind the limiting plate to reduce the pressure of the medium entering the sampling valve group, which solves the problem that the pressure reducing valve at the medium inlet of the existing sampling valve often fails to reduce pressure and leaks, reduces the difficulty of sampling operation, and makes sampling safer. The utility model also has the advantages of simple structure, easy assembly, reliable operation, and long service life. The utility model is a process of changing high-pressure sampling to low-pressure sampling, converting the sampler inlet from high pressure (10.5MPa) to low pressure (2.5MPa), canceling the pressure reducing valve, and reducing the difficulty of sampling operation. To ensure the long-term, safe and stable operation of the device, specifically, the medium flowing out of the limiting hole of the limiting plate is connected to the low-gas desulfurization tower inlet pipeline (low-gas desulfurization system) in one way, and the other way is connected to the corresponding sampling valve inlet. The sampling valve inlet pressure is kept consistent with the low-gas desulfurization tower pressure (2.5MPa). Specifically, the working pressure of the low-gas desulfurization system is 2.5MPa. After the high-pressure gas passes through the limiting plate, it is connected to the low-gas system so that the pressure after the limiting orifice is also 2.5MPa. The utility model mainly relates to the sampling structure part on the diesel hydrocracking unit.

[0041] A one-way valve 10 is provided between the limiting plate 9 and the low-gas desulfurization system 8. The one-way valve 10 is used to conduct one-way flow and prevent the medium from flowing back in the low-gas desulfurization system 8. The one-way valve is provided to prevent the medium from flowing back in the low-gas desulfurization system when the medium is insufficient at the limiting plate, so that the product sampling and detection is accurate.

[0042] The flow limiting plate 9 is provided with a flow hole, the aperture of which is 2-5 mm, and the maximum flow rate of the sampling valve group 7 during sampling is less than the design flow rate at the flow limiting plate 9. The aperture of the flow hole in the utility model is 3 mm. In this way, the amount of medium entering the sampling valve can be reasonably set, which is convenient for reliable sampling.

[0043] The pipeline assembly 6 includes a first pipeline 61, which is provided between the cold high separator 2 and the circulating hydrogen desulfurization tower 3 and is used for the medium flow between the cold high separator 2 and the circulating hydrogen desulfurization tower 3;

[0044] The sampling valve assembly 7 includes a first sampling valve 71, which is provided on the first pipeline 61 for sampling. The pipeline assembly 6 includes a second pipeline 62, which is provided between the liquid separator 5 and the circulating hydrogen compressor 4, and is used for the medium flow between the liquid separator 5 and the circulating hydrogen compressor 4;

[0045] The sampling valve assembly 7 includes a second sampling valve 72, which is provided on the second pipeline 62 for sampling. The pipeline assembly 6 includes a third pipeline 63, which is provided between the high-pressure reactor 1 and the circulating hydrogen compressor 4, and is used for the medium flow between the high-pressure reactor 1 and the circulating hydrogen compressor 4;

[0046] The sampling valve group 7 includes a third sampling valve 73, which is arranged on the third pipeline 63 for sampling. The structures of the first sampling valve, the second sampling valve, and the third sampling valve in the present invention can be the same or similar. The present invention only makes a distinction for the convenience of description, not to imply their relative importance. The first sampling valve and the second sampling valve are used to monitor the hydrogen sulfide content before and after the circulating hydrogen desulfurization tower, so as to judge the desulfurization effect of the circulating hydrogen desulfurization tower.

[0047] The utility model also includes a new hydrogen compressor 11, which is connected to the third pipeline 63, and the third sampling valve 73 is used to sample the mixed hydrogen at the outlet of the new hydrogen compressor 11 and the circulating hydrogen compressor 4. The third sampling valve is used to monitor the purity of hydrogen entering the reactor system, which includes the hydrogen in the system itself and the hydrogen supplemented by the new hydrogen compressor.

[0048] The sampling valve group 7 comprises:

[0049] A medium inlet 74 connected to the pipeline assembly 6 for medium entry;

[0050] Auxiliary port 75, for inert medium to enter the cleaning sampling valve group 7;

[0051] A sampling bottle 76, used for sampling and collecting the medium introduced into the medium inlet;

[0052] A pressure gauge 77, used to detect the pressure at the sampling bottle 76;

[0053] The three-way valve 78 is connected to the medium inlet 74, the auxiliary port 75 and the sampling bottle 76 respectively; a circulating water cooler 741 is provided between the medium inlet 74 and the three-way valve 78. The setting of the pressure reducing valve is reduced at the medium inlet, so that the product production cost is low, the parts are easy to assemble, and the problems of failure to reduce pressure and leakage caused by the high-pressure medium entering the pressure reducing valve are avoided; at the same time, the difficulty of sampling operation is reduced, and sampling is safer.

[0054] A pressure reducing valve 751, a sampling check valve 752 and a needle valve 753 are arranged in sequence between the auxiliary port 75 and the three-way valve 78. The needle valve is added after the sampling check valve to prevent the sampling check valve from leaking internally and toxic and harmful media from leaking out of the pressure reducing valve. Generally speaking, the pressure of the auxiliary port is usually around 0.7MPa. After the sampling is completed, the residual gas can be blown away to facilitate the next sampling.

[0055] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0056] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, in the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0057] Technical personnel should note: Although the utility model has been described according to the above specific implementation methods, the utility model concept is not limited to this utility model. Any modification using the utility model concept will be included in the scope of protection of the utility model patent right.

Claims

1. A diesel hydrocracking unit, comprising a high-pressure reactor (1) and a cold high-pressure separator (2); characterized in that Also included: A circulating hydrogen desulfurization tower (3) is used to receive the medium separated by the cold high separator (2) and use it for desulfurization; A circulating hydrogen compressor (4), used for driving the medium circulation; A liquid separator (5) is disposed between the circulating hydrogen desulfurization tower (3) and the circulating hydrogen compressor (4) and is used to separate gas and liquid from the medium discharged from the circulating hydrogen desulfurization tower (3) and to supply gaseous medium to the circulating hydrogen compressor (4); A pipeline assembly (6) is used to connect the cold high pressure separator (2) and the circulating hydrogen desulfurization tower (3), the liquid separator (5) and the circulating hydrogen compressor (4), and the circulating hydrogen compressor (4) and the high-pressure reactor (1) to allow the medium to circulate; A sampling valve group (7) is used to sample the pipeline assembly (6), and the sampling valve group (7) is connected to the low-gas desulfurization system (8); The flow limiting plate (9) is arranged between the pipeline assembly (6) and the low-gas desulfurization system (8), and the sampling valve group (7) is arranged behind the flow limiting plate (9) and samples the medium behind the flow limiting plate (9).

2. The diesel hydrocracking unit according to claim 1, characterized in that A one-way valve (10) is provided between the flow limiting plate (9) and the low-gas desulfurization system (8), and the one-way valve (10) is used for one-way conduction and preventing the medium of the low-gas desulfurization system (8) from flowing back.

3. The diesel hydrocracking unit according to claim 1, characterized in that The flow limiting plate (9) is provided with a flow hole, the aperture of the flow hole is 2-5 mm, and the maximum flow rate of the sampling valve group (7) during sampling is less than the design flow rate at the flow limiting plate (9).

4. The diesel hydrocracking unit according to claim 3, characterized in that The diameter of the through-flow hole is 3 mm.

5. The diesel hydrocracking unit according to claim 1, characterized in that The pipeline assembly (6) comprises a first pipeline (61), which is arranged between the cold high pressure separator (2) and the circulating hydrogen desulfurization tower (3) and is used for the flow of medium between the cold high pressure separator (2) and the circulating hydrogen desulfurization tower (3); The sampling valve group (7) comprises a first sampling valve (71) which is arranged on the first pipeline (61) and is used for sampling.

6. The diesel hydrocracking unit according to claim 1, characterized in that The pipeline assembly (6) comprises a second pipeline (62), which is arranged between the liquid separator tank (5) and the circulating hydrogen compressor (4) and is used for the medium to flow between the liquid separator tank (5) and the circulating hydrogen compressor (4); The sampling valve group (7) comprises a second sampling valve (72) which is arranged on the second pipeline (62) and is used for sampling.

7. The diesel hydrocracking unit according to claim 1, characterized in that The pipeline assembly (6) comprises a third pipeline (63), which is arranged between the high-pressure reactor (1) and the circulating hydrogen compressor (4) and is used for the medium to flow between the high-pressure reactor (1) and the circulating hydrogen compressor (4); The sampling valve group (7) comprises a third sampling valve (73) which is arranged on the third pipeline (63) and is used for sampling.

8. The diesel hydrocracking unit according to claim 7, characterized in that It also includes a new hydrogen compressor (11), the new hydrogen compressor (11) is connected to the third pipeline (63), and the third sampling valve (73) is used to sample the mixed hydrogen at the outlets of the new hydrogen compressor (11) and the circulating hydrogen compressor (4).

9. The diesel hydrocracking unit according to claim 1, characterized in that The sampling valve group (7) comprises: A medium inlet (74) connected to the pipeline assembly (6) for medium entry; Auxiliary port (75) for inert medium to enter the cleaning sampling valve group (7); A sampling bottle (76) is used to sample and collect the medium introduced into the medium inlet; A pressure gauge (77) for detecting the pressure at the sampling bottle (76); The three-way valve (78) is respectively connected to the medium inlet (74), the auxiliary port (75) and the sampling bottle (76); a circulating water cooler (741) is provided between the medium inlet (74) and the three-way valve (78).

10. The diesel hydrocracking unit according to claim 9, characterized in that A pressure reducing valve (751), a sampling one-way valve (752) and a needle valve (753) are provided in sequence between the auxiliary port (75) and the three-way valve (78).

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